Question

question 17 (2.5 points)
fossil footprint of a bipedal species in tanzania revealed that the walkers feet had a pronounced arch and a big toe in line with the other toes. this is an indication of:
hands and feet capable of grasping
large brain for their body size
touch - sensitive pads protected by flattened nails
adaptations to upright walking
question 18 (2.5 points)
bipedalism can be defined as
grasping ability of hands and feet
walking upright

Explanation:

• For Question 17: A pronounced arch and a big toe in line with other toes are features that help in maintaining balance and efficient movement while walking upright. Grasping ability (first option) is more related to hands/feet with opposable digits. A large brain (second option) is not indicated by foot structure. Touch - sensitive pads (third option) are not relevant to the described foot features for bipedalism.
• For Question 18: Bipedalism specifically refers to the locomotion pattern of walking on two legs (upright walking). Grasping ability (first option) is a different trait not defining bipedalism.

Answer:

Question 17: adaptations to upright walking
Question 18: walking upright